Documents disponibles écrits par cet auteur

Design and control of heterogeneous azeotropic column system for the separation of pyridine and water / Yi Chang Wu in Industrial & engineering chemistry research, Vol. 48 N° 23 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10564–10576 Titre : Design and control of heterogeneous azeotropic column system for the separation of pyridine and water Type de document : texte imprimé Auteurs : Yi Chang Wu, Auteur ; Chien, I-Lung, Auteur Année de publication : 2010 Article en page(s) : pp. 10564–10576 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Design--Control--Heterogeneous--Azeotropic--Column--  Separation--Pyridine Résumé : The design and control of two types of separation systems using heterogeneous azeotropic distillation have been studied in the literature. One type (e.g., isopropyl alcohol dehydration) is to add a light entrainer (cyclohexane) into the system so that a minimum-boiling ternary azeotrope is formed which can split into two liquid phases in a decanter. This type of system also introduces two additional azeotropes (isopropyl alcohol−cyclohexane and water−cyclohexane), thus dividing the ternary system into three distillation regions. Another type (e.g., acetic acid dehydration) does not contain azeotrope in the original system. However, due to a tangent pinch near the pure water end an entrainer (isobutyl acetate) is added into the system to aid the separation. This type of system has only one binary heterogeneous azeotrope (water−isobutyl acetate); thus there is only one distillation region. In this paper, design and control of a different residue curve map (RCM) type of separation system utilizing heterogeneous azeotropic distillation will be studied. An example of this RCM type is pyridine and water separation using toluene as entrainer. Adding toluene into this system introduces two additional azeotropes, one is minimum-boiling binary heterogeneous azeotrope (water−toluene) and the other one is a binary homogeneous azeotrope (pyridine−toluene). There is no ternary azeotrope for this system. Two alternative design flow sheets are compared in this paper to find the one which is most economical and also meet stringent product purity specifications. A simple overall control strategy of this process has also been developed which requires only one temperature control loop in each column. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901231s [article] Design and control of heterogeneous azeotropic column system for the separation of pyridine and water [texte imprimé] / Yi Chang Wu, Auteur ; Chien, I-Lung, Auteur . - 2010 . - pp. 10564–10576. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10564–10576 Mots-clés : Design--Control--Heterogeneous--Azeotropic--Column--  Separation--Pyridine Résumé : The design and control of two types of separation systems using heterogeneous azeotropic distillation have been studied in the literature. One type (e.g., isopropyl alcohol dehydration) is to add a light entrainer (cyclohexane) into the system so that a minimum-boiling ternary azeotrope is formed which can split into two liquid phases in a decanter. This type of system also introduces two additional azeotropes (isopropyl alcohol−cyclohexane and water−cyclohexane), thus dividing the ternary system into three distillation regions. Another type (e.g., acetic acid dehydration) does not contain azeotrope in the original system. However, due to a tangent pinch near the pure water end an entrainer (isobutyl acetate) is added into the system to aid the separation. This type of system has only one binary heterogeneous azeotrope (water−isobutyl acetate); thus there is only one distillation region. In this paper, design and control of a different residue curve map (RCM) type of separation system utilizing heterogeneous azeotropic distillation will be studied. An example of this RCM type is pyridine and water separation using toluene as entrainer. Adding toluene into this system introduces two additional azeotropes, one is minimum-boiling binary heterogeneous azeotrope (water−toluene) and the other one is a binary homogeneous azeotrope (pyridine−toluene). There is no ternary azeotrope for this system. Two alternative design flow sheets are compared in this paper to find the one which is most economical and also meet stringent product purity specifications. A simple overall control strategy of this process has also been developed which requires only one temperature control loop in each column. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie901231s

Design and control of a methyl methacrylate separation process with a middle decanter / Yi Chang Wu in Industrial & engineering chemistry research, Vol. 50 N° 8 (Avril 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4595–4607 Titre : Design and control of a methyl methacrylate separation process with a middle decanter Type de document : texte imprimé Auteurs : Yi Chang Wu, Auteur ; C. S. Hsu, Auteur ; Huang, Hsiao-Ping, Auteur Année de publication : 2011 Article en page(s) : pp. 4595–4607 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Methyl  Methacrylate  Separation  process Résumé : In an industrial process to produce methyl methacrylate, a mixture including methyl methacrylate, methanol, and water needs to be separated. The methyl methacrylate and water are designed to be drawn out of this separation process as two product streams while methanol as an excess reactant should be recycled back to the esterification reactor. An industrial feasible design flowsheet includes three columns, a decanter and two internal recycle streams. In this work, a simple design flowsheet is devised with a distillation column, a bottom decanter, and a stripper. This column/decanter/stripper design can further be simplified into an even simpler design flowsheet with only one distillation column with sidedraw and a middle decanter. Optimal design and dynamic control of this simplified separation process are investigated in this paper. It is shown that the product purity specifications can be maintained despite feed disturbances by holding a tray temperature above the sidedraw location and another one below the sidedraw location. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102570n [article] Design and control of a methyl methacrylate separation process with a middle decanter [texte imprimé] / Yi Chang Wu, Auteur ; C. S. Hsu, Auteur ; Huang, Hsiao-Ping, Auteur . - 2011 . - pp. 4595–4607. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 8 (Avril 2011) . - pp. 4595–4607 Mots-clés : Methyl  Methacrylate  Separation  process Résumé : In an industrial process to produce methyl methacrylate, a mixture including methyl methacrylate, methanol, and water needs to be separated. The methyl methacrylate and water are designed to be drawn out of this separation process as two product streams while methanol as an excess reactant should be recycled back to the esterification reactor. An industrial feasible design flowsheet includes three columns, a decanter and two internal recycle streams. In this work, a simple design flowsheet is devised with a distillation column, a bottom decanter, and a stripper. This column/decanter/stripper design can further be simplified into an even simpler design flowsheet with only one distillation column with sidedraw and a middle decanter. Optimal design and dynamic control of this simplified separation process are investigated in this paper. It is shown that the product purity specifications can be maintained despite feed disturbances by holding a tray temperature above the sidedraw location and another one below the sidedraw location. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie102570n

Two-stripper/decanter flowsheet for methanol recovery in the TAME reactive-distillation process / Yi Chang Wu in Industrial & engineering chemistry research, Vol. 48 N° 23 (Décembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10532–10540 Titre : Two-stripper/decanter flowsheet for methanol recovery in the TAME reactive-distillation process Type de document : texte imprimé Auteurs : Yi Chang Wu, Auteur ; Chien, I-Lung, Auteur Année de publication : 2010 Article en page(s) : pp. 10532–10540 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Two-Stripper/Decanter--Flowsheet--Methanol--Recovery--TAME--Reactive-Distillation--Process Résumé : The process to produce TAME via reactive distillation requires a methanol-recovery section because the presence of C5/methanol azeotropes means that a significant amount of methanol is present in the distillate from the reactive column. The use of pressure-swing azeotropic distillation and extractive distillation were studied in a previous paper in which both the steady-state design and the plantwide control of the entire process were developed. This paper considers a third alternative flowsheet for the separation of the C5/methanol azeotropes that takes advantage of the heterogeneity of the azeotrope. Two stripping columns and a decanter are used. The total annual cost of this flowsheet is a factor of 4 less than that of the pressure-swing system. The system is demonstrated to be easy to control by controlling a tray temperature in each stripping column. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900670f [article] Two-stripper/decanter flowsheet for methanol recovery in the TAME reactive-distillation process [texte imprimé] / Yi Chang Wu, Auteur ; Chien, I-Lung, Auteur . - 2010 . - pp. 10532–10540. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 23 (Décembre 2009) . - pp. 10532–10540 Mots-clés : Two-Stripper/Decanter--Flowsheet--Methanol--Recovery--TAME--Reactive-Distillation--Process Résumé : The process to produce TAME via reactive distillation requires a methanol-recovery section because the presence of C5/methanol azeotropes means that a significant amount of methanol is present in the distillate from the reactive column. The use of pressure-swing azeotropic distillation and extractive distillation were studied in a previous paper in which both the steady-state design and the plantwide control of the entire process were developed. This paper considers a third alternative flowsheet for the separation of the C5/methanol azeotropes that takes advantage of the heterogeneity of the azeotrope. Two stripping columns and a decanter are used. The total annual cost of this flowsheet is a factor of 4 less than that of the pressure-swing system. The system is demonstrated to be easy to control by controlling a tray temperature in each stripping column. ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900670f